A cobpoeation



July 10, 1-928. I w 4 1,676,353 L. A. RUSSELL CRANE AND SHOVEL CONVERTIBLE OPERATING MECHANISM Filed Dec. 5

925 ts-Sheet x July 10, 1928.

1,676,353 1.. A. RUSSELL l CRANE AND SHOVEL CONVERTIBLE OPERATING MECHANISM Filed Dec; 5, 1925 3 Sheets-Sheet 2 Jul 10;, 1928. N

' L A. RUSSELL CRANE AND SHOVEL UJNVERTIB'LE OPERATING MECHANISM Filed Dec- 1925 3 Sheets-Sheet attmm um Patented July 10, 1928. f!

hll'llE TATES PATENT FEEQE.

LESLIE A. RUSSELL, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO KOEHRING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION.

, CRANE -AND SHOVEL CONVERTIBLE OPERATING MECHANISM.

Application filed December It is known in the art oi cranes and power ehovelsthat the general operating mechanism of a crane, by some modification or other, may be availed of to convert the crane from a machine for doing clam-shell or drag-line work into a power shovel for accomplishing the usual work of the latter. In other vords, by removal of the crane boom and bucket employed for clam-shell or drag-line work, and the substitution. of a shovel boom and dipper, and properly connecting up either of such means with the operating mechanism on the body of the crane, a convertible machine is obtainable.

In practice, it is quite customary in effecting the conversion from one type aforesald to the other, to remove certain of the operating drum and gear mechanism and substitute other such mechanism dependent upon the particular type of machine which to be employed. Without going into further detail in this connection, it is notable that the present invention relates to What are commonly known today as Koehrlng crane constructions which are convertible from clam-shell and drag-line work to shovel work in the general way above outlined, encepting that in the Koehring machines, it is unnecessary ordinarily to displace any of the heavier operating parts, a mere substitution of one boom and bucket type for the other being required only with a rearrangement of the cables as necessary for the particular kind of work to be done.

In these crane machines, it is customary to use a boom hoist drum mechanism for changingtheelevation of the boom used for clam-shell and drag-line work. It has not been so customary to use any such means for raisingand lowering the boom of a power shovel but latterly it has been found advantageous to do this in order to increase the scope of usefulness of the shovel and its capacity to handle certain kinds of work.

In the Letters Patent of Holcomb & Russell No. 1,506,906, September 2nd, 1924, in which lam a joint inventor, there is pro posed a method of using the boom hoist drum as a means to operate the front drum of the crane when it isto be employed for power shovel purposes. The provisions involve, however, connections that must be put in the machine, or taken of? when the desired conversion is made. In my presentinvention, I use the boom hoist clutch, provided 3, 1925. Serial N0. 72,925.

for operating the boom hoist drum, as an operating device not only for such specified purpose, but also to actuate the front drum when shovel, work is to be performed. Under these conditions I am enabled to convert the crane from a, machine to do crane work so called, like that done by clam-shell and drag-line machines, into a power shovel, simply by properly operating the mechanism. In fact, a power shovel machine embodying my invention, may be converted into a clam-shell or drag-line crane, or crane for other work, by the mere changing of the boom, boom cables, and excavating equipment handled thereby, and shifting of suitable clutch devices. The conversion is one involving the necessity of driving the forward drum mechanism in the swing body, in reverse directions for shovel work (to rack in and crowd'out the dipper), and one direction for clam-shell and drag-line work (as aclosing line or drag-line actuator, respectively).

I am not aware that in any prior machine, the above convertibility has been obtainable without change in the arrangement, and replacement, or removal, of certain operating parts, and hence my invention is to be understood as comprehending the foregoing general phase of construction and operation.

Additionally, this invention contemplates the utilization of the boom hoist clutch means aforesaid to perform the separate and independent function of coacting with the shipper shaft mechanism of the dipper handle of a shovel, whereby to control one of the regular working movements of said dipper handle. In the present instance, I utilize the boom hoist clutch for performing the function of racking in the shovel dipper, under which conditions said boom hoist mechanism will cooperate with the main cable drum mechanismalways provided in these crane type machines.

7 More specifically speaking, my invention involves certain clutch and gear devices susceptible of being used for actuating a racking in drum cooperative with a shovel dipper, as one function, the clutch device for actuating a boom hoist drum as a separate function, and the gear device being susceptible of application to the body mecha nism of the crane Without in any way requiring the removal of any of the main actuating mechanism of the latter.

In the accompanying drawings:

Figure 1 is a plan view of the body operating mechanism of a crane such as useful for the purposes of the invention, the front main drum being omitted in the illustration.

Figure 2 is a sectional view taken horizontally through the drum mechanism of the crane showing the two main holding and closing line drums which are used for clamshell and drag-line work under independent controls, and also illustrating the boom hoist drum for the special clutch and gear devices forming this invention, associated with the boom hoist drum and the front main drum.

Figure 3 is a view of the gear member attachable to the boom hoist clutch.

Figure 4 is a side view showing more particularly the detachable split gears used to transmit racking in movement to the front main drum together with the intermediate reversing gear intermeshing therewith.

Figure 5 is a diagrammatic view of a shovel embodying my operating mechanism.

Figure 6 is a diagrammatic view of a clam-shell or drag-line type crane embodying my operating mechanism.

To those versed in the art of cranes, it willbe noted that the mechanism hereof ineludes the front main drum 1 and the rear main drum 2 which in the type of crane of this invention constitute the holding and closing line drums for operating a clam-shell bucket when the crane is doing clam-shell work. IVhen the crane is' doing shovel work alone, the front drum 1 is employed as a crowding and racking in drum by utilizing a cable means winding about said drum 1 in opposite directions and leading to the shipper shaft on the shovel boom to pass about the latter in opposite directions also, where by the turning of the drum in one direction will cause a crowding out movement of the shovel dipper handle or sticks and a turning movement of the drum in an opposite direction will cause a racking in movement of said handle. In a general way, typical mechanism, suchas I have just referred to, is illustrated in Figure 6 of the United States patent of Holcomb and Russell, #1,509,925 issued September 23rd, 1924, see also 1,506,906, issued September 2nd, 1924.

As typical of a crane machine embodying clam-shell and drag-line features and equipped with the operating mechanism herein set forth, Figure 6 may be referred to for illustrative purposes. In this figure, the front drum mechanism is shown at 1 and the rear drum mechanism is shown at 2. These mechanisms are hereinafter described in detail. In Figure (3, the shovel boom is designated 25, the dipper stick 26, the ship 'per drum and pinion means at 27, the dipper at 28, the dipper hoisting cable at 29 and the thrusting cable used for the shipper drum, at 30.

In Figure 6, the front and rear drum mechanisms are indicated as previously designated, the clam-shell boom is designated at 31, the clam-shell bucket at 32, the closing line at 33 leading to the front drum mechanism 1 and the hoisting line at 34 leading to the rear drum mechanism designated 2. This figure also shows the drag-line bucket 35 and method of connecting it up with the boom and drum mechanisms aforesaid.

The method of connecting the thrust cable 30 with the shipper drum mechanism for racking in and crowding out the dipper stick 26, with the drum mechanism 1 is shown clearly in Figure 5 in the manner described at the beginning hereof. The front drum mechanism, or front drum 1 for the purposes of this description may be considered as embodying said drum 1 and parts mounted on the shaft by which it is driven. The rear drum mechanism 2 may be similarly considered as embodying the same general assemblage of parts upon its supporting shaft.

There is associated with the drum 1 suit able clutch means at the right hand end of same for operating the drum for its crowding movement. A special clutch means for operating the drum for its racking in movement performing solely such function is usually employed but with my invention I do away with such means entirely and utilize instead .the clutch means which are employed for controlling the action of the boom hoist drum designated The drum 3 is mounted with the drum 2, loosely on the rear shaft 4, while the drum 1 is mounted upon the front shaft 5 of the main drum mechanism. Drum 2 has a clutch'surface 2 and brake surface 2; and drum '3 has brake surface 3*.

It is known that in crane work, the boom hoist line which leads to the drum 3 is not very often operated because the boom adjustments are only required at considerable intervals of time. At least this is true as to clam-shell and drag-line work, though the boom adjustments are more frequently desirable in shovel work. On the above account, I am enabled to take advantage of the clutch operating means for the boom hoist drum 3 as the corresponding means for driving the drum 1 in one direction, namely that necessary for racking in operation of a shovel dipper, while other means may turn tl e drum 1 for crowding out action.

Assuming for the purposes of this description, that the operating drum mechanism comprising the drums 1, 2 and 3 have been utilized for what is'called crane work, and it is desired to enable their use for shovel work, the crane boom and cable apparatus are removed and a shovel boom' for a dipper and cable apparatus are substituted. The cable for operating the dipper sticks is then attached to the drum 1, to turn about the same in reverse directions, the dipper hoisting cable is attached to the drum 2 for operation as usual by the drum 2, and the boom hoist cable of the shovel boom, is attached to the drum 3. Thereupon I secure to the boom hoist clutch 6 having clutch teeth 8 a gear member '7, shown best in Figure 3, the member 7 having gear teeth 5) externally thereof. The fastening means may be bolts or any similar fastenings 10, passing through the outermost peripheral portion of the clutch 6 just beyond its teeth 8.

To drive the drum 1 from the gear teeth 9 of the member 7, I employ an attachable gear member 11 secured by bolts or similar fastenings 12 to the left hand end of the drum 1. The gear 11 andthe gear 7 will preferably be made of split formation as shown best in Figures 3 and 1. To connect gears 7 and 11, I use anintermediate reversing 'gear' 13, suitably mounted upon the frame work of the machine as by stub shaft or the like. 4

'VVith the foregoing parts, it will be evident that by the adjustment of the clutch member 6, as shownin Figure 2, a reverse drive for racking in purposes may be communicated from the shaft 4 to the drum 1. This will drive the drum in one direction. hen it is desired to drive the drum 1 in an opposite'direction for crowding out action of the dipper, the clutch means at the right hand end of the drum '1, including the clutch drum 1* maybe used. Should it be desired to vary the elevation of the boom carrying the shovel dipper the clutch member 6 will be shifted to carry the gear 7 out of mesh with the gear 13 and engage the clutch teeth 8 with the clutch teeth 14 provided on the left hand end of the boom hoist drum '3. Under these conditions, the clutch means 6 and 8 Will be active in relation to the drum 3 and the gear 7 inactive in relation to the gearing 13 and 11.

lVhen it is desired to use the operating mechanism hereof for crane purposes, as for drag-line and clam-shell work. the jaw clutch teeth 8 may be constantly held in mesh with the clutch teeth 14 of the drum 3 and the gear teeth 9 out of mesh with the gear 13. While this may be effected by an actuating lever which throws the clutch member 6 if desired a spacing collar may be interposed between the clutch member 6 and the bearing 15 at the left thereof which collar will perform the function referred to, and can be readily taken off at any time it is desired to'use the mechanism for shovel purposes. The said collar would be a split collar to facilitate its application and removal to the shaft 4 between the pa ts15 and 6. l

The shafts 4i and 5 are constantly running shafts driven by suitable gearing, from the main power line, including the hoist gearF which is keyed to the shaft 4 and turns all the time the engine clutch is engaged. The drums 1 and 2 are clutched to these shafts in the customary way by the clutch mecha nism at the right hand ends. In shovel work, such clutch mechanism for the drum 1 performs the crowding action and for the drum 2 the dipper hoist operation.

In crane work, the drums 1 and 2 operate the holding and closing of the cable lines.

While certain of the clutch'and brake features of the machine are known in the art, it may be desirable to briefly refer to them as to some phases of detail. On reference to Figure 2, it will be understood that the drive of the drum 1 in one direction will be effected by clutch means not shown, carried by the gear G keyed on the shaft 5, this clutch means involving clutch bands encircling the clutch drum 1 previously referred to as being at the right hand end of the drum 1. The other end of the drum 1 has a brake surface 1 to which a brake may be applied in the customary way.

In like manner, the gear H keyed to the shaft 4 carries clutch band operating means actuating clutch bands encircling the clutch surface 2 of the drum 2 and a suitable brake band will encircle the brake surface 2 of said drum 2.

The clutch means for actuating the boom hoist clutch 6 includes operating devices not shown, but carried by the gear F keyed to the shaft at, the clutch means including a band or bands encircling the clutch drum E which has the sleeve 15 on which the boom hoist clutch 6 is fixedly mounted, or keyed. Under these conditions, of course, the clutch drum E with its sleeve 15 and the clutch 6 will not be rotated until the clutch operating means, carried by the gear F, is actuated to cause turning of the drum E with the gear F and shaft 4.

Adetailed feature of importance of the construction of the hoist drum 3 is the provision of ratchet teeth 3 on said drum, just below or inside of the brake surface 3 thereof; These ratchet teeth 3 perform a peculiar function by being engageable by a ratchet pawl 20 that is utilized to lock the drum 3 against rotation during those periods when it is not to be used for adjusting the angle of the boom. It should be borne in mind that the angle of the boom is not changed very frequently so that during the periods of inactivity of the drun'i 3, it is highly desirable that it should be locked against accidental movement by means other than the mere locking action incident to tightening the brake band that encircles the brake surface 3 of said drum. When the operator of the crane has the machine located so that he must raise and lower the boom with some degree of frequency, the

brake band coacting with the brake surface 3* will be employed for the purpose, the ratchet pawl being held inoperative. Under other conditions, however, the pawl 20 will be engaged with the ratchet teeth 3" to positively lock the drum 3 against turning that would permit lowering of the boom. The ratchet teeth 3 are so shaped that be fore the pawl 20 can be disengaged therefrom, it is necessary to apply power to sligl'itly wind the boom hoist cable on the drum 3. Under these conditions, the boom supporting means ailorded by the drum 3 is rendered accident proof as there is no liability that the boom can be caused to accidently drop when *hildren are playing around the machine at night, by the mere release of the friction brake that coacts with the brake surface 3 Under these condi tions, there must be a release of said brake means 3 and the ratciui-t pawl 20 as well.

i-i-rny suitable means may be employed in order to operate the ratchet pawl 20.

It will be evident that since the jaw clutch member (3 has the gear 7 as a detacl'iable feature thereof, by machine may be sold for general crane work with the parts 7, ll and i3 omitted under which comlitions a spacer collar will preferably be interposed between the member 6 and the shoulder portion of the bearing 15 at the left ot the clutch, to positively and substantially perim-rnently maintain the clutch 6 engaged with the drum teeth 14 as suggested hereinbetore.

Obviously it my machine is put out as a shovel crane, the various parts 7, 11 and 13 will be in place and no change of machinery whatever is required to convert the machine into a clam-shell or drag-line crane. It is only necessary to properly control or move the clutch and gear 6 and clutch band around the clutch drum E.

Moreover, the type of drum mechanism used for my invention as designated in Figure 1 at 2, involves outer drum lagging about which clam-shell equipped cables will be wound tor clan'i-shell work or drag-line work it the same speed on the cable lines is desired. It a lower speed for the dragline cable lines is desired, the inner lagging shown as surrounded by the outer cable lagging may be exposed by removal of the outer cable lagging and used. This feature of my invention, however, is embodied in a separate application for patent so that the claims hereof are not directed thereto.

Having thus described my invention what I claim as new and desire to cover by Letters Patent oi the United States, is

1. In operating mechanism for crane and shovel type machines, in combination, main drums for actuating the holding and closing lines of a clam-shell crane, a boom hoist drum, and clutch means for the boom hoist drum for controlling the raising and lowering of the boom of such a crane, and means for establishing alternative cooperation between the boom hoist drumclutch means and one of the main drums or the boom hoist drum when the said main drums are being used for cooperation with a shovel d i p per.

In operating mechanism for crane and shovel type machines, in combination, a main drum mechanism for operating cable means of a clam-shell or drag-line crane, boom hoist drum mechanism for raising and lowering the boom of such cranes, driving means for operating the drum-of said main drum mechanism in one direction, driving means for operating the said drum of the main drum mechanism in an opposite direc tion, and control means intermediate the last mentioned driving means and the boom hoist drum mechanism for alternatively rendering said last mentioned driving means operative either to drive the main drum mechanism in said opposite direction or to actuate said boom hoist drum mechanism.

3. In operating mechanism for crane and shovel type machines, in combination, main drums for actuating the holding and closing lines 01'' a clam-shell crane, a boom hoist drum and clutch means for controlling the raising and lowering of the b0omof such a crane, and means for connecting one of said main drums to be operated by the boom hoist drum clutch means in one direction when the said main drums are being used for cooperation with a shovel dipper, means for turning the main drum that is operable by the boom hoist drum clutch means, in an opposite direction, this two direction movement being adapted to control crowding and racking in movements of a shovel dipper, and means for operating the other main drum to enable its use as a hoisting means for said shovel dipper, the said connecting means comprising a jaw clutch for operating the boom hoist drum to change the elevation of the boom of either a cranetype machine or a shovel type machine, and gearing between said clutch and the main drum operable from the boom hoist drum clutch means.

4. Operating mechanism for crane type machines such as used for clam-shell and drag-line work, and for power shovel type machines, the said mechanism comprising main operating drums that are used for operating the holding and closing lines of a clam-shell, a boom hoist drum and clutch means forming a part of said operating mechanism and adapted to hoist the boom of either crane boom and bucket apparatus or power shovel boom and dipper apparatus, and manually controllable means for connecting and disconnecting one of the main hoist drums with the boom hoist drum clutch means for driving the former so that it may participate in the function of the hoist drums with the shovel dipper of the power shovel apparatus 5. Operating mechanism for crane type machines such as used for cla1n-shell and drag-line work, and for power shovel type machines, the said mechanism comprising main operating drums that are used for operating the holding and closing lines of a clam-shell, a boom hoist drum and clutch means forming a part of said operating mechanism and adapted to hoist the boom of either crane boom and bucket apparatus or power shovel and dipper apparatus, and manually controllable means for connecting and disconnecting one of. the main hoist drums with the boom hoist drum clutch means for driving the former so that it may participate in the function of the shovel dipper of the power shovel apparatus, the said manually controllable means including a clutch, and gearing attachable to said clutch and to one of the main drums for transmitting the movement of the boom hoist drum clutch means to the latter as stated.

(3. Operating mechanism for crane type machines such as used for clam-shell and drag-line work, and for power shovel type machines, the said mechanism comprising main operating drums that are used for operating the holding and closing lines of a clam-shell, a boom hoist drum and clutch means forming a part of said operating mechanism and adapted to hoist the *boom of either crane boom and bucket apparatus or power shovel boom and dipper apparatus, and manually controllable means for con.- necting and disconnecting one of the main boom hoist drum clutch means for driving the former so that it may participate in the function of the shovel dipper of the power shovel apparatus, the said manually controllable means including a clutch, and gearing attachable to said clutch and to one of the main drums for transmitting the movement of the boom hoist drum clutch means to the said main drum, the said gearing involving attachable gears for application to the clutch member and to the main drum operated from the boom hoist drum clutch means, with a reverse gear intermediate of said gears, and means to operate the main drum actuated from the boom hoist drum clutch means in a direction opposite that in which it is op erated by the boom hoist drum clutch means.

7 In operating mechanism for crane andshovel type machines, in combination, main drums for actuating the holding and closing lines of a clam-shell crane, a boom hoist drum and clutch means for controlling the raising and lowering of the boom of sucha crane, and means for connecting one of sand main drums to be operated by the boom hoist drum clutch means in one direction when the said main drums are being used clam-shell, or drag-line, work, operating for cooperation with a shovel dipper, means for turning the main drum that is operable by the boom hoist drum clutch means in an opposite direction, this two direction movementbeing adapted to control crowding and racking in movements of a shovel dipper, and means for operating the other main drum to enable its use as a hoisting means for said shovel dipper, the boom hoist drum being equipped. with brake means whereby it may be held against turning to lower the boom.

8. In a shovel crane, mechanism adapted to be used for other crane purposes such as mechanism comprising a front drum, a rear drum, a boom hoist drum and a clutch device shiftable in one way to cause coaction thereof to transmit driving forces to the boom hoist drum and shiftable in another way to transmit driving forces to one of the other drums aforesaid.

9. In a shovel crane mechanism comprising a shovel thrust cable operating drum, a dipper hoist drum, a drive shaft, a gear connecting the drive shaft with the cable thrust drum to turn the latter in one direction, gearing for connecting the drive shaft with the cable thrust drum to turn the latter in an opposite direction, manual means to render the last mentioned gearing inoperative so that the said drums may be connected up with operating cables of clam-shell or dragline type cranes without removal or replacement of parts of the general mechanism, and a boom hoist drum associated with said drive shaft and connectible with said gearing for operation thereby when the same is inoperative to actuate the cable thrust drum.

10. In a shovel crane mechanism comprising a shovel thrust cable operating drum, a dipper hoist drum, a drive shaft, a gear connecting the drive shaft with the cable thrust drum to turn the latter in one direction, gearing for connecting the drive shaft with the cable thrust drum to turn thelatter in an opposite direction and manual means to render the last mentioned gearing inoperative so that the said drums may be connected up with operating cables of clamshell or drag-line type cranes without removal or replacement of partsof the general mechanism, a boom hoist drum asso ciated with said drive shaft and connectiblewith said gearing for operation thereby when the same is inoperativ to actuate the cable thrust drum, including a clutch device,

a boom hoist drum mounted on said drive shaft and means for shifting said clutch device in one wayv to act on said boom hoist drum and become inoperative in reference to said main drum, and to shift said clutch in another way to render it active to impart driving forces to the main drum.

11. An operating drum mechanism for power shovel types for operation of the excavating means of said different types of cranes without removal or replacement of any of the parts of said'operating mechanism including front and rear drums and supporting shafts therefor, drive means intermediate the supporting shafts for operating one of the drums in a certain direction, gearing connecting one of said shafts with thedrum operated ins-aid certain direction, to turn said drum in an opposite direction and effective when the operating mechanism is used for power shovel purpose to enable said particular drum to be turned in reverse directions, and means whereby to render said gearing inactive when the drums of the operating mechanism are utilized for other than power shovel-crane purposes, and comprising a. clutch, and a hoistdrum adapted to be operated by said clutch.

12. An operating drum mechanism for cranes of the drag-line, clam-shell and power shovel types for operation of the excavating means of said different types of cranes without removal or replacement of any of the parts of said operating mechanism including front and rear drums, and supporting shafts therefor, in combination, a front drum mechanism comprising a drum and supporting shaft, dipper operating means carried by said front drum, a. rear drum mechanism comprising a main drum and supporting shaft, means for driving the front drum in one direction for crowding out action thereof on a dipper shovel, means for'drivin said front drum in an opposite direction for-racking in action thereof on a dipper shovel, dipper hoisting means adapted to be connected with the rear drum. and means to render the last mentioned driving means inoperative without removal or re placement of parts of the drum mechanisms whatever so that when a clam-shell or other type excavating apparatus is connected up with the front and rear drums these may be driven without reverse operation of the front drum, for the purposes of such clamshell or other type crane work, said means for rendering the last mentioned driving means inactive consisting of a clutch comprising a driving member for transmitting driving'forces to the front drum, and a second driving member, and a boom hoist drum adapted to be engaged by the second driving member of the clutch for the purpose described.

13. An operating drum mechanism for cranes of the drag-line, clam-shell, and power shove-l types for operation of the excavating means of said different types of cranes without removal or replacement of any of the parts of said operating mechanism including front and rear drums and supporting shafts therefor, in combination, a front drum mechanism comprising a drum and supporting shaft, a dipper operating means carried by said front drum, a rear drum mechanisi'n comprising a main drum and supporting shaft, means for driving the front drum in one direction for crowding out action thereof on a dipper shovel, means for driving said front drum in an opposite direction for racking in action thereof on a dipper shovel, dipper hoisting means adapted to be connected with the rear drum, and means to render the last mentioned driving means inoperative without removal or replacement of parts of the drum mechanisms whatever so that when a clam-shell or other type excavating apparatus is connected up with the front and rear drums these may be driven without reverse operation of the front drum, for the purposes of such clam-shell or other type crane work, said means for rendering the last mentioned driving means in.- operative consisting of a clutch member adapted for manual operation and having a driving element for tra-nsn'iitting driving forces to the front drum for its shovel work, said clutch member having a. second driving element, other drun'i means than those we viously mentioned operable by said second driving element when the first mentioned driving element of the clutch is inactive to operate the front drum.

14. An operating drum mechanism for cranes of the drag-line, clam-shell, and power shovel types for operation of the cavating means of said. different types of cranes without removal or replacement of any of the parts of saidoperating mechanism including front and rear drums, in combination, a front drum reversibly operable for dipper thrusting operations, a rear drum for dipper hoisting actions, a third operating drum, means for communicating movement in one direction to the front drum, means for communicating in an opposite direction to the front drum, the last mentioned means consisting of a clutch common to the front drum for transmitting driving forces thereto, and to the third operating drum for transmitting driving forces thereto, and means for effecting alternative cooperation of the clutch with the front drum and the third operating drum specified.

In testimony whereof I aflix my signature.

LESLIE A. RUSSELL. 

